Patent · US Expired

Process for preparing 1-aza-2-hydroxybenzanthrone

US3960866A · kind A · utility

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5Claims
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Key dates

Filing dateJul 17, 1974
Grant dateJun 1, 1976
Priority date—
Expiry dateJul 17, 1994

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07D221/18
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

1-AZA-2-HYDROXYBENZANTHRONE, USEFUL AS AN INTERMEDIATE FOR SYNTHESIZING DYES IS OBTAINED BY THE DIRECT REACTION OF ALKYL ESTERS OF ANTHRAQUINONE-1-ACETIC ACID WITH AMMONIA IN HYDROXYLATED SOLVENTS AND IN THE PRESENCE OF STRONG BASES AND/OR REDUCING SUBSTANCES.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.